
amp=0.1;
Fs=48000;
f_noisy_1=0;
f_noisy_2 = 0;
f_noisy_3 = 4500;
f_noisy_4 = 0;


t=0:1/Fs:1-1/Fs;
noisy = amp*cos(2*pi*f_noisy_1*t')+amp*cos(2*pi*f_noisy_2*t');
noisy = noisy + amp*cos(2*pi*f_noisy_3*t')+ amp*cos(2*pi*f_noisy_4*t');
while true
    sound(noisy, Fs);
    pause(1);
end